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Table 4 PSNR values of compressed images using original and optimized DCTs

From: A novel method for the approximation of multiplierless constant matrix vector multiplication

Image Original Optimized Optimized Optimized
   ε 1=ε =4 ε 1=ε =8 ε 1=ε =16
Cheese 25.5 25.5 24.7 24.7
Cameraman 25.12 25.12 23.77 23.77
Lena 30.92 30.92 27 27